Sony's teasing something over on its Facebook page. It looks like a red, round thing that pops open. It might reveal a PS4 disc tray or, more likely, the hole you plug your MP3 player into in order to get the party started. Or, even less thrillingly, it might be an Easter egg. A joke. A stupid, rubbish joke, that we've just fallen for. What do you think? Thing or no thing? [Facebook]